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                <span class="article-type type-1 float-left">原创</span>                <h1 class="title-article">轻松玩转AI（从Python开始之Python3入门）</h1>
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                                                                                                                                                                <span class="time">2018-08-15 15:27:55</span>
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                                            <p><strong>轻松玩转AI路径：</strong></p>

<ol>
<li>　 <a href="https://blog.csdn.net/qq_42663265/article/details/81605489#t9" rel="nofollow" target="_blank"><strong>从Python开始</strong> [链接]</a></li>
<li>　<strong>数据科学</strong> [链接]</li>
<li>　<strong>机器学习</strong> [链接]</li>
<li>　<strong>深度学习——神经网络</strong> [链接]</li>
</ol>

<hr>

<p><strong>从Python开始：</strong></p>

<ul>
<li><a href="https://blog.csdn.net/qq_42663265/article/details/81605489#t9" rel="nofollow" target="_blank"><strong>Python3入门</strong> [链接]</a></li>
<li><a href="https://blog.csdn.net/qq_42663265/article/details/81705436" rel="nofollow" target="_blank"><strong>Python3进阶</strong> [链接]</a></li>
<li><a href="https://blog.csdn.net/qq_42663265/article/details/81748608" rel="nofollow" target="_blank"><strong>Python3高级编程和异步IO并发编程</strong> [链接]</a></li>
</ul>

<hr>

<p><strong>Python3入门 目录：</strong></p>

<p><div class="toc">
<ul>
<li><a href="#1-简介" rel="nofollow">1. 简介</a></li>
<li><a href="#2-数据类型" rel="nofollow">2. 数据类型</a></li>
<li><a href="#3-变量表达式运算符" rel="nofollow">3. 变量、表达式、运算符</a></li>
<li><a href="#4-流程控制语句" rel="nofollow">4. 流程控制语句</a></li>
<li><a href="#5-组织结构" rel="nofollow">5. 组织结构</a></li>
<li><a href="#6-面向对象" rel="nofollow">6. 面向对象</a></li>
<li><a href="#7-正则表达式" rel="nofollow">7. 正则表达式</a></li>
<li><a href="#8-枚举类型" rel="nofollow">8. 枚举类型</a></li>
<li><a href="#函数式编程" rel="nofollow">函数式编程：</a></li>
<li><a href="#9-闭包" rel="nofollow">9. 闭包</a></li>
<li><a href="#10-匿名函数" rel="nofollow">10. 匿名函数</a></li>
<li><a href="#11-装饰器" rel="nofollow">11. 装饰器</a></li>
</ul>
</div>
</p>

<hr>

<h1 id="1-简介">1. 简介</h1>

<ul>
<li><p><strong>Python的特点：简洁</strong></p></li>
<li><p><strong>Python是面向对象的语言：</strong></p>

<ul><li>把现实解释中各种各样事物的关系和特征映射到计算机中。</li></ul></li>
<li><p><strong>Python适合的领域：</strong></p>

<ul><li>爬虫</li>
<li>大数据与数据分析</li>
<li>自动化运维与自动化测试</li>
<li>Web开发</li>
<li>机器学习</li>
<li>作为“胶水”语言把其他语言开发的模块包装来方便使用</li></ul></li>
<li><p><strong>Python不适合的领域：</strong></p>

<ul><li>贴近硬件的代码（首选C）</li>
<li>移动开发：iOS/Android有各自的开发语言（ObjC，Swift/Java）</li>
<li>游戏开发：C/C++</li></ul></li>
<li><p><strong>Python和其他语言对比：</strong> <br>
<img src="https://img-blog.csdn.net/20180812131016142?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNjYzMjY1/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70" alt="Python和其他语言对比" title=""></p></li>
</ul>

<hr>



<h1 id="2-数据类型">2. 数据类型</h1>

<p><img src="https://img-blog.csdn.net/20180813152450252?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNjYzMjY1/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70" alt="python基本数据类型" title=""></p>

<ul>
<li><strong>不可变类型（值类型）：数字、字符串、元组</strong></li>
<li><p><strong>可变类型（引用类型）：列表、集合、字典</strong></p></li>
<li><p><strong>type(Data) 可查询数据类型函数</strong></p></li>
<li><strong>isinstance(对象, [数据类型1, 数据类型2]) 可判断对象是否是数据类型1…</strong></li>
</ul>

<p><strong>1. 数字：Number</strong></p>

<ul>
<li>不可变类型（值类型）</li>
<li>整数：int</li>
<li>浮点数：float</li>
</ul>

<blockquote>
  <p>0b开头为二进制，bin(Number) 转换为二进制 <br>
  0o开头为八进制，oct(Number) 转换为八进制 <br>
  0x开头为十六二进制，hex(Number) 转换为十六进制 <br>
  int(Number) 转换为十进制</p>
</blockquote>

<ul>
<li>Bool 布尔类型：表示真（True）、假（False）</li>
</ul>

<blockquote>
  <p>真表示数字：1 <br>
  假表示数字：0 <br>
  bool(Number)：Number 为0或空或None则假（False），非0或非空则真（True）。</p>
</blockquote>

<ul>
<li>complex：复数</li>
</ul>

<p><strong>2. 组</strong></p>

<p><strong>1） 序列</strong></p>

<p><strong>（1） 字符串：str</strong></p>

<ul>
<li>用 <strong><code>单引号（' '）、双引号（" "）、三引号(''' '''/""" """)</code></strong> 表示字符串。</li>
<li>字符串可以为空</li>
<li>字符串是<strong>有序</strong>序列，可用下标<strong>索引</strong>来访问、<strong>切片</strong>操作</li>
<li><p>不可变类型（值类型）</p></li>
<li><p>转义字符：\</p>

<ul><li>特殊的字符。</li>
<li>无法“看见”的字符。</li>
<li>与语言本身语法有冲突的字符。</li></ul>

<table>
<thead>
<tr>
  <th>转义字符符号</th>
  <th>说明</th>
</tr>
</thead>
<tbody><tr>
  <td>\n</td>
  <td>换行</td>
</tr>
<tr>
  <td>\’</td>
  <td>单引号</td>
</tr>
<tr>
  <td>\t</td>
  <td>横向制表符</td>
</tr>
<tr>
  <td>\r</td>
  <td>回车</td>
</tr>
</tbody></table>
</li>
<li><p>原始字符串：r</p></li>
</ul>

<p><strong>[1] 字符切片</strong></p>

<ul>
<li>每个字符均有从头部 0开始增大的索引，或从尾部 -1开始减少的索引。 <br>
例：</li>
</ul>



<pre class="prettyprint"><code class=" hljs python"><span class="hljs-prompt">&gt;&gt;&gt; </span><span class="hljs-string">"hello work"</span>[<span class="hljs-number">0</span>]
<span class="hljs-string">"h"</span>

<span class="hljs-prompt">&gt;&gt;&gt; </span><span class="hljs-string">"hello work"</span>[-<span class="hljs-number">1</span>]
<span class="hljs-string">"k"</span>

<span class="hljs-prompt">&gt;&gt;&gt; </span><span class="hljs-string">"hello work"</span>[:]
<span class="hljs-string">"hello work"</span>

<span class="hljs-prompt">&gt;&gt;&gt; </span><span class="hljs-string">"hello work"</span>[<span class="hljs-number">1</span>:]
<span class="hljs-string">"ello work"</span>

<span class="hljs-prompt">&gt;&gt;&gt; </span><span class="hljs-string">"hello work"</span>[<span class="hljs-number">1</span>:<span class="hljs-number">3</span>]
<span class="hljs-string">"el"</span>

<span class="hljs-prompt">&gt;&gt;&gt; </span><span class="hljs-string">"hello work"</span>[<span class="hljs-number">1</span>:-<span class="hljs-number">3</span>]
<span class="hljs-string">"ello w"</span>

<span class="hljs-prompt">&gt;&gt;&gt; </span><span class="hljs-string">"hello work"</span>[:-<span class="hljs-number">3</span>]
<span class="hljs-string">'hello w'</span></code></pre>

<p><strong>[2] 字符运算</strong></p>

<p>例：</p>



<pre class="prettyprint"><code class=" hljs python"><span class="hljs-prompt">&gt;&gt;&gt; </span><span class="hljs-string">"hello work"</span> + <span class="hljs-string">"s"</span>
<span class="hljs-string">"hello works"</span>
<span class="hljs-prompt">&gt;&gt;&gt; </span><span class="hljs-string">"hello work"</span>*<span class="hljs-number">3</span>
<span class="hljs-string">"hello workhello workhello work"</span></code></pre>

<blockquote>
  <p>字符运算无减法、除法，乘法只能乘以整数。</p>
</blockquote>

<p><strong>（2） 列表：list</strong></p>

<ul>
<li>列表的表示方式：[ ]</li>
<li>列表可包含 <strong>数字、字符、组</strong></li>
<li>列表可以为空</li>
<li>列表是<strong>有序</strong>序列，可用下标<strong>索引</strong>来访问、<strong>切片</strong>操作</li>
<li>可变类型（引用类型）</li>
</ul>

<p>例：</p>



<pre class="prettyprint"><code class=" hljs php">[<span class="hljs-string">"hello"</span>,<span class="hljs-number">2</span>,<span class="hljs-keyword">True</span>,[<span class="hljs-number">1</span>,<span class="hljs-number">2</span>],[<span class="hljs-keyword">True</span>,<span class="hljs-keyword">False</span>]]
<span class="hljs-comment"># 列表可嵌套</span></code></pre>

<p><strong>[1] 列表切片</strong></p>

<ul>
<li>每个列表中的元素均有从头部 0开始增大的索引，或从尾部 -1开始减少的索引。</li>
</ul>

<p>例：</p>



<pre class="prettyprint"><code class=" hljs markdown">&gt;&gt;&gt; [<span class="hljs-link_label">"hello", "work", "i", "love"</span>][<span class="hljs-link_reference">0</span>]
"hello"
<span class="hljs-header"># 单一取元素索引</span>

&gt;&gt;&gt; [<span class="hljs-link_label">"hello", "work", "i", "love"</span>][<span class="hljs-link_reference">0:2</span>]
["hello", "work"]
<span class="hljs-header"># : 则取元素列表</span>
&gt;&gt;&gt; [<span class="hljs-link_label">"hello", "work", "i", "love"</span>][<span class="hljs-link_reference">-1:</span>]
["love"]</code></pre>

<p><strong>[2] 列表运算</strong></p>

<p>例：</p>



<pre class="prettyprint"><code class=" hljs python"><span class="hljs-prompt">&gt;&gt;&gt; </span>[<span class="hljs-string">"hello"</span>, <span class="hljs-string">"work"</span>, <span class="hljs-string">"i"</span>, <span class="hljs-string">"love"</span>] + [<span class="hljs-string">"you"</span>]
[<span class="hljs-string">"hello"</span>, <span class="hljs-string">"work"</span>, <span class="hljs-string">"i"</span>, <span class="hljs-string">"love"</span>, <span class="hljs-string">"you"</span>]

<span class="hljs-prompt">&gt;&gt;&gt; </span>[<span class="hljs-string">"you"</span>] * <span class="hljs-number">3</span>
[<span class="hljs-string">"you"</span>, <span class="hljs-string">"you"</span>, <span class="hljs-string">"you"</span>]</code></pre>

<blockquote>
  <p>列表运算无减法、除法，乘法只能乘以整数。</p>
</blockquote>

<p><strong>（2） 元组：tuple</strong></p>

<ul>
<li>元组表示方式：( )</li>
<li>单一元素的元组需加 <strong>， 逗号</strong></li>
<li>元组可包含 <strong>数字、字符、组</strong> </li>
<li>元组可以为空</li>
<li>元组是<strong>有序</strong>序列，可用下标<strong>索引</strong>来访问、<strong>切片</strong>操作</li>
<li>不可变类型（值类型）</li>
</ul>

<p>例：</p>



<pre class="prettyprint"><code class=" hljs python"><span class="hljs-prompt">&gt;&gt;&gt; </span>(<span class="hljs-number">1</span>,<span class="hljs-number">2</span>,<span class="hljs-number">3</span>,<span class="hljs-number">4</span>,<span class="hljs-number">5</span>)
(<span class="hljs-number">1</span>,<span class="hljs-number">2</span>,<span class="hljs-number">3</span>,<span class="hljs-number">4</span>,<span class="hljs-number">5</span>)
<span class="hljs-prompt">&gt;&gt;&gt; </span>(<span class="hljs-number">1</span>,)
(<span class="hljs-number">1</span>)
<span class="hljs-prompt">&gt;&gt;&gt; </span>()
()</code></pre>

<p><strong>[1] 元组切片</strong></p>

<ul>
<li>每个元组中的元素均有从头部 0开始增大的索引，或从尾部 -1开始减少的索引。</li>
</ul>

<p>例：</p>



<pre class="prettyprint"><code class=" hljs python"><span class="hljs-prompt">&gt;&gt;&gt; </span>(<span class="hljs-number">1</span>,<span class="hljs-string">"-1"</span>,true)[<span class="hljs-number">0</span>]
<span class="hljs-number">1</span>

<span class="hljs-comment"># : 则取元素元组</span>
<span class="hljs-prompt">&gt;&gt;&gt; </span>(<span class="hljs-number">1</span>,<span class="hljs-string">"-1"</span>,<span class="hljs-keyword">True</span>)[<span class="hljs-number">0</span>:<span class="hljs-number">2</span>]
(<span class="hljs-number">1</span>,<span class="hljs-string">"-1"</span>)</code></pre>

<p><strong>[2] 元组运算</strong></p>

<p>例：</p>



<pre class="prettyprint"><code class=" hljs vala">&gt;&gt;&gt; (<span class="hljs-number">1</span>,<span class="hljs-string">"-1"</span>,<span class="hljs-literal">true</span>)+(<span class="hljs-number">4</span>,<span class="hljs-number">5</span>)
(<span class="hljs-number">1</span>,<span class="hljs-string">"-1"</span>,<span class="hljs-literal">true</span>,<span class="hljs-number">4</span>,<span class="hljs-number">5</span>)

<span class="hljs-preprocessor"># : 则取元素元组</span>
&gt;&gt;&gt; (<span class="hljs-number">1</span>,<span class="hljs-string">"-1"</span>,<span class="hljs-literal">true</span>)*<span class="hljs-number">3</span>
(<span class="hljs-number">1</span>,<span class="hljs-string">"-1"</span>,<span class="hljs-literal">true</span>,<span class="hljs-number">1</span>,<span class="hljs-string">"-1"</span>,<span class="hljs-literal">true</span>,<span class="hljs-number">1</span>,<span class="hljs-string">"-1"</span>,<span class="hljs-literal">true</span>)</code></pre>

<blockquote>
  <p>元组运算无减法、除法，乘法只能乘以整数。</p>
</blockquote>

<p><strong>2） 集合：set</strong></p>

<ul>
<li>定义空集合方式：set()</li>
<li>集合是<strong>无序</strong>，没有索引，没有切片</li>
<li>集合内所有元素类型要相同</li>
<li>集合自动去重</li>
<li>可变类型（引用类型）</li>
</ul>

<p>例：</p>



<pre class="prettyprint"><code class=" hljs python"><span class="hljs-prompt">&gt;&gt;&gt; </span>{<span class="hljs-number">1</span>, <span class="hljs-string">"hello"</span>}
{<span class="hljs-number">1</span>, <span class="hljs-string">"hello"</span>}</code></pre>

<p><strong>（1） 集合运算</strong></p>

<ul>
<li>差集：-</li>
</ul>

<p>例：</p>



<pre class="prettyprint"><code class=" hljs css">&gt;&gt;&gt; <span class="hljs-rules">{<span class="hljs-rule">1,2,3,4,5,6}</span></span> <span class="hljs-tag">-</span> <span class="hljs-rules">{<span class="hljs-rule">3,4}</span></span>
<span class="hljs-rules">{<span class="hljs-rule">1,2,5,6}</span></span></code></pre>

<ul>
<li>交集：&amp;</li>
</ul>

<p>例：</p>



<pre class="prettyprint"><code class=" hljs css">&gt;&gt;&gt; <span class="hljs-rules">{<span class="hljs-rule">1,2,3,4,5,6}</span></span> &amp; <span class="hljs-rules">{<span class="hljs-rule">3,4}</span></span>
<span class="hljs-rules">{<span class="hljs-rule">3,4}</span></span></code></pre>

<ul>
<li>并集：|</li>
</ul>

<p>例：</p>



<pre class="prettyprint"><code class=" hljs mathematica">&gt;&gt;&gt; <span class="hljs-list">{1,2,3,4,5,6}</span> | <span class="hljs-list">{3,4,7}</span>
<span class="hljs-list">{1,2,3,4,5,6,7}</span></code></pre>

<p><strong>4） 字典：dict</strong></p>

<ul>
<li>字典的表示方式：{ }</li>
<li>字典由键值对组成，即 key:value</li>
<li>字典是<strong>无序</strong>，没有索引、切片操作</li>
<li>通过 key 访问 value</li>
<li>key 不能重复，必须为不可变类型（数字、字符串、元组）</li>
<li>value 可以是 数字、字符串、组</li>
<li>可变类型（引用类型）</li>
</ul>

<p>例：</p>



<pre class="prettyprint"><code class=" hljs python"><span class="hljs-prompt">&gt;&gt;&gt; </span>{<span class="hljs-string">"2"</span>:<span class="hljs-string">"hello"</span>,<span class="hljs-string">"1"</span>:<span class="hljs-string">"work"</span>,<span class="hljs-number">1</span>:<span class="hljs-string">"love"</span>}[<span class="hljs-string">"1"</span>]
work

<span class="hljs-prompt">&gt;&gt;&gt; </span>{<span class="hljs-string">"2"</span>:<span class="hljs-string">"hello"</span>,<span class="hljs-string">"1"</span>:<span class="hljs-string">"work"</span>,<span class="hljs-number">1</span>:<span class="hljs-string">"love"</span>}[<span class="hljs-number">1</span>]
love</code></pre>

<hr>



<h1 id="3-变量表达式运算符">3. 变量、表达式、运算符</h1>

<p><strong>1） 变量</strong></p>

<ul>
<li>赋值语句：<strong>变量 = 值</strong></li>
<li>变量名可包含<strong>字母、数字、下划线</strong>，首字母不能为数字</li>
<li>变量名区分大小字</li>
<li>变量名不能用<strong>系统关键字（保留字）</strong> <br>
<img src="https://img-blog.csdn.net/20180813155642174?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNjYzMjY1/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70" alt="python3保留字" title=""></li>
</ul>

<p><strong>2） 表达式</strong></p>

<ul>
<li><strong>表达式</strong>（Expression）是<strong>运算符</strong>（operator）和<strong>操作符</strong>（operand）所构成的序列。</li>
</ul>

<p><strong>3） 运算符</strong></p>

<p><img src="https://img-blog.csdn.net/20180813163115156?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNjYzMjY1/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70" alt="python算术运算符" title=""></p>

<p><img src="https://img-blog.csdn.net/20180813163352233?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNjYzMjY1/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70" alt="python位运算符" title=""></p>

<p><img src="https://img-blog.csdn.net/20180813163150840?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNjYzMjY1/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70" alt="python比较运算符" title=""></p>

<p><img src="https://img-blog.csdn.net/2018081316313638?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNjYzMjY1/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70" alt="python赋值运算符" title=""></p>

<p><img src="https://img-blog.csdn.net/20180813163242165?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNjYzMjY1/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70" alt="python身份运算符" title=""></p>

<p><img src="https://img-blog.csdn.net/20180813163221802?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNjYzMjY1/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70" alt="python成员运算符" title=""></p>

<p><img src="https://img-blog.csdn.net/20180813163203808?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNjYzMjY1/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70" alt="python逻辑运算符" title=""></p>

<p><img src="https://img-blog.csdn.net/20180813181947568?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNjYzMjY1/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70" alt="python运算符优先级" title=""> <br>
<strong>运算符同一级别则按 表达式 <code>从左向右</code> 运算</strong></p>

<hr>



<h1 id="4-流程控制语句">4. 流程控制语句</h1>

<ul>
<li>条件、循环、分支、枚举</li>
<li><p>条件、循环、分支、枚举 皆可互相嵌套使用</p>

<ul><li><strong>continue</strong>  跳出后继续执行</li>
<li><strong>break</strong> 强制结束控制语句</li></ul></li>
</ul>

<p><strong>1） 条件语句</strong></p>

<ul>
<li>if elif else</li>
</ul>



<pre class="prettyprint"><code class=" hljs cs"><span class="hljs-keyword">if</span> 条件判断<span class="hljs-number">1</span>:   <span class="hljs-preprocessor"># True</span>
    执行语句<span class="hljs-number">1</span>
elif 条件判断<span class="hljs-number">2</span>: <span class="hljs-preprocessor"># True</span>
    执行语句<span class="hljs-number">2</span>
<span class="hljs-keyword">else</span>:          <span class="hljs-preprocessor"># 非真值条件</span>
    pass       <span class="hljs-preprocessor"># pass 空语句/占位语句</span>
<span class="hljs-preprocessor"># <span class="hljs-keyword">if</span>  <span class="hljs-keyword">elif</span>  只执行其中一个</span></code></pre>

<p><strong>2） 循环语句</strong></p>

<ul>
<li>while else</li>
<li>for else</li>
</ul>



<pre class="prettyprint"><code class=" hljs vala">a = True
<span class="hljs-keyword">while</span> a:
    执行语句
<span class="hljs-preprocessor"># 死循环</span>

b = <span class="hljs-number">1</span>
<span class="hljs-keyword">while</span> b &lt;= <span class="hljs-number">10</span>:
    b += <span class="hljs-number">1</span>
    执行语句<span class="hljs-number">1</span>
<span class="hljs-preprocessor"># 执行10次</span>
<span class="hljs-keyword">else</span>:      # <span class="hljs-keyword">while</span> 返回False时执行
    执行语句<span class="hljs-number">2</span></code></pre>



<pre class="prettyprint"><code class=" hljs python"><span class="hljs-comment"># 主要是用来遍历/循环、序列或者集合、字典</span>
<span class="hljs-keyword">for</span> 新变量x <span class="hljs-keyword">in</span> 可迭代对象:
    执行语句<span class="hljs-number">1</span>
    print(x)
<span class="hljs-keyword">else</span>:       <span class="hljs-comment"># for 结束后执行</span>
    执行语句<span class="hljs-number">2</span></code></pre>

<hr>



<h1 id="5-组织结构">5. 组织结构</h1>

<ul>
<li><strong>包</strong> <br>
<ul><li><strong>模块</strong> <br>
<ul><li><strong>类</strong> <br>
<ul><li><strong>函数、变量</strong></li></ul></li></ul></li></ul></li>
</ul>

<blockquote>
  <p>包：文件夹 <br>
  模块：.py 文件</p>
</blockquote>

<ul>
<li><p>命名空间：<strong>包名.模块名</strong></p></li>
<li><p>引用/导入：</p>

<pre><code># 同一路径下
import 模块名

# 不同路径下
import 包名.模块名
或
import 包名.模块名 as 新名

# 导入模块
from 包名 import 模块

# 导入模块内具体的函数/变量
from 包名.模块名 import 函数名/变量名

# 全部导入模块内所有的函数/变量
from 包名.模块名 import *
</code></pre></li>
<li><p>包和模块不会被重复导入。</p></li>
</ul>

<p><strong>1） 包</strong></p>

<pre><code>定义包：在包内建 __init__.py 文件。
</code></pre>

<p><strong>（1） <em>_init_</em>.py</strong></p>

<pre><code>__init__.py 文件在包被使用时会自动加载。

# 自动加载模块：
__all__ = ['模块名1','模块名n']
</code></pre>

<p><strong>2） 函数</strong></p>

<p><strong>（1） 函数的特性：</strong></p>

<ol>
<li>功能性</li>
<li>隐藏细节</li>
<li>避免编写重复的代码</li>
</ol>

<p><strong>（2） 函数基本结构</strong></p>



<pre class="prettyprint"><code class=" hljs python"><span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">funcname</span><span class="hljs-params">(parameter_list)</span>:</span>
    <span class="hljs-keyword">pass</span>

funcname(parameter_list)  <span class="hljs-comment"># 函数调用</span>

<span class="hljs-comment"># 1. parameter_list 参数列表可以没有</span>
<span class="hljs-comment"># 2. 可使用 return value 来返回结果，否则返回 None</span></code></pre>

<p>例：</p>



<pre class="prettyprint"><code class=" hljs python"><span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">add</span><span class="hljs-params">(x, y=<span class="hljs-number">0</span>)</span>:</span>      <span class="hljs-comment"># y=0 为无传参时默认 y=0</span>
    result = x + y
    q = <span class="hljs-number">4</span>
    <span class="hljs-keyword">return</span> result, q  <span class="hljs-comment"># 多个则返回元组</span>
    print(<span class="hljs-string">'ok'</span>)       <span class="hljs-comment"># 不会被执行</span>

<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">print_code</span><span class="hljs-params">(code)</span>:</span>
    print(code)

a = add(<span class="hljs-number">1</span>, <span class="hljs-number">2</span>) 
b = print_code(<span class="hljs-string">'python'</span>)  <span class="hljs-comment"># 赋值时函数被调用执行</span>

print(a, b)
<span class="hljs-comment"># 返回：</span>
<span class="hljs-comment">#    python</span>
<span class="hljs-comment">#    (3, 4) None</span>

p1_add, p2_add = add(<span class="hljs-number">3</span>, <span class="hljs-number">4</span>)  <span class="hljs-comment"># 序列解包</span>
print(p1_add, p2_add)
<span class="hljs-comment"># 返回：</span>
<span class="hljs-comment">#    7  4</span></code></pre>

<p>序列解包例：</p>



<pre class="prettyprint"><code class=" hljs livecodeserver">d = <span class="hljs-number">1</span>, <span class="hljs-number">2</span>, <span class="hljs-number">3</span>  <span class="hljs-comment"># 生成元组</span>
<span class="hljs-operator">a</span>, b, c = d  <span class="hljs-comment"># 序列解包，数量需要相同</span>
<span class="hljs-comment"># 等同于 a, b, c = [1, 2, 3]</span></code></pre>

<p><strong>（3） 函数参数</strong></p>

<ul>
<li>必须参数：形参、实参</li>
<li>关键字参数</li>
<li>默认参数</li>
</ul>

<p>例：</p>



<pre class="prettyprint"><code class=" hljs python"><span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">add</span><span class="hljs-params">(x, y=<span class="hljs-number">0</span>)</span>:</span>      <span class="hljs-comment"># x,y 为形式参数（形参）；y=0 为无传参时默认为0（默认参数）</span>
    result = x + y
    <span class="hljs-keyword">return</span> result

a = add(<span class="hljs-number">1</span>, <span class="hljs-number">2</span>)    <span class="hljs-comment"># 1,2 为实际参数（实参）</span>
b = add(y=<span class="hljs-number">3</span>, x=<span class="hljs-number">4</span>)  <span class="hljs-comment"># y=3, x=4 为关键字参数</span></code></pre>

<hr>



<h1 id="6-面向对象">6. 面向对象</h1>

<ul>
<li><strong>核心：类、对象</strong></li>
</ul>

<p><strong>1） 类：class</strong></p>

<p><img src="https://img-blog.csdn.net/20180814203607937?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNjYzMjY1/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70" alt="python类" title=""></p>

<p><strong>变量代表刻划类的特征，方法代表类的行为。</strong></p>

<ul>
<li>类最基本的作用：<strong>封装</strong></li>
<li>类名首字母大写</li>
<li>类名不建议使用 <strong>_ 下划线</strong> 分隔，建议使用<strong>小驼峰法</strong>（即每个不同的单词首字母大写）。</li>
</ul>



<pre class="prettyprint"><code class=" hljs python"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">StudentRoom</span><span class="hljs-params">()</span>:</span>
    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">print_file</span><span class="hljs-params">(self)</span>:</span>
        print(<span class="hljs-string">'name:'</span> + self.name)

student = StudentRoom()  <span class="hljs-comment"># 实例化</span>
student.print_file()     <span class="hljs-comment"># 调用类的方法</span></code></pre>

<p><strong>（1）类的 方法 和 函数 的区别</strong></p>

<ul>
<li><strong>方法</strong>：设计层面 （更多是面向对象）</li>
<li><strong>函数</strong>：程序运行、过程式的一种称谓 （更多是面向过程）</li>
<li><strong>变量</strong>：存在于模块内，一般称为 变量；而存在于类内，一般称为 数据成员。</li>
</ul>

<p><strong>（2） 类 和 对象 的关系和区别</strong></p>

<ul>
<li><p><strong>类</strong> 是现实世界或思维世界中的实体在计算机中的反映，它将数据以及这些数据上的操作封装在一起。（抽象概念）</p></li>
<li><p>类面向对象设计最重要是：<strong>行为</strong> 与 <strong>特征</strong></p>

<ul><li>要找对主体，即类内的 函数 作用要相似或一致。</li></ul></li>
<li><p><strong>对象</strong> 是用来表示一个具体的概念。当 类 被实例化后就成为一个具体的对象，并需要传递具体的数据。</p></li>
<li><p><strong>类就像是一个模板，通过类可以产生很多的对象。</strong></p></li>
</ul>

<p><strong>2） 类的构造函数</strong></p>

<ul>
<li>构造函数可以生成不同的对象</li>
<li>类被实例化后构造函数会自动被调用</li>
</ul>



<pre class="prettyprint"><code class=" hljs python"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">StudentRoom</span><span class="hljs-params">()</span>:</span>

    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">__init__</span><span class="hljs-params">(self)</span>:</span>  <span class="hljs-comment"># 构造函数。</span>
        <span class="hljs-keyword">pass</span>

student = StudentRoom()  <span class="hljs-comment"># 实例化</span></code></pre>

<p><strong>3） 类变量、实例变量、实例方法、类方法、静态方法</strong></p>



<pre class="prettyprint"><code class=" hljs python"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">StudentRoom</span><span class="hljs-params">()</span>:</span>
    name = <span class="hljs-string">'1'</span>   <span class="hljs-comment"># 类变量</span>
    sum = <span class="hljs-number">0</span>

    <span class="hljs-comment"># 有self则为 实例方法，代表实例。</span>
    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">__init__</span><span class="hljs-params">(self, name, age)</span>:</span> 
        <span class="hljs-comment"># 构造函数初始化对象的属性</span>
        self.name = name  <span class="hljs-comment"># 实例变量，保存特征值</span>
        print(self.__class__.name)  <span class="hljs-comment"># 打印类变量。</span>

    <span class="hljs-decorator">@classmethod   # 类方法。装饰器</span>
    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">plus_sum</span><span class="hljs-params">(cls)</span>:</span>
        cls.sum += <span class="hljs-number">1</span>
        print(cls.sum)

    <span class="hljs-decorator">@staticmethod  # 静态方法。装饰器</span>
    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">add</span><span class="hljs-params">(x, y)</span>:</span>
        print(<span class="hljs-string">'This is a static method'</span>)

student = StudentRoom(<span class="hljs-string">'小兔'</span>, <span class="hljs-number">20</span>)  <span class="hljs-comment"># 创建对象</span>
print(student.name)      <span class="hljs-comment"># 返回 小兔</span>
print(StudentRoom.name)  <span class="hljs-comment"># 返回 1</span>

<span class="hljs-comment"># __dict__ 保存着所有实例变量</span>
print(student.__dict__)  <span class="hljs-comment"># 返回 {'name':'小兔'}</span>

<span class="hljs-comment"># 调用 类方法</span>
StudentRoom.plus_sum()

<span class="hljs-comment"># 调用 静态方法</span>
StudentRoom.add(<span class="hljs-number">1</span>,<span class="hljs-number">2</span>)</code></pre>

<blockquote>
  <p>类方法和静态方法不能访问实例变量</p>
</blockquote>

<p><strong>4） 类的成员可见性</strong></p>

<ul>
<li>公开成员、私有成员</li>
<li>私有成员外部无法访问</li>
</ul>



<pre class="prettyprint"><code class=" hljs python"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Student</span><span class="hljs-params">()</span>:</span>

    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">__init__</span><span class="hljs-params">(self, name)</span>:</span> 
        self.name = name
        self.__score = <span class="hljs-number">0</span>  <span class="hljs-comment"># 含 __ 则为私有变量</span>

    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">marking</span><span class="hljs-params">(self, score)</span>:</span> 
        <span class="hljs-keyword">if</span> score &lt; <span class="hljs-number">0</span>:
            <span class="hljs-keyword">return</span> <span class="hljs-string">'负数不合法'</span>
        self.score = score
        print(self.name + str(self.score))

    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">do_homework</span><span class="hljs-params">(self)</span>:</span>
        self.do_english_homework()  <span class="hljs-comment"># 内部调用</span>
        print(<span class="hljs-string">'homework'</span>)

    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">__do_english_homework</span><span class="hljs-params">(self)</span>:</span>  <span class="hljs-comment"># 含 __ 则为私有方法</span>
        print()

student = Student(<span class="hljs-string">'小兔'</span>)
student.marking(<span class="hljs-number">90</span>)   <span class="hljs-comment"># 保证数据安全  # 返回 小兔90</span>
student.do_english_homework()  <span class="hljs-comment"># 外部调用</span>
student.__score = -<span class="hljs-number">1</span>  <span class="hljs-comment"># 此非原有类中的私有变量，而是增加新的私有变量。</span>
print(student.__dict__)
print(student._Student__score)  <span class="hljs-comment"># 间接访问私有变量</span></code></pre>

<p><strong>5） 面向对象3大特性</strong></p>

<ul>
<li><strong>继承性、多态性、封装性</strong></li>
</ul>

<p><strong>（1） 继承性</strong></p>

<ul>
<li>作用：避免定义重复的方法、重复的变量。</li>
</ul>

<p><img src="https://img-blog.csdn.net/20180814183437612?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNjYzMjY1/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70" alt="类的继承性" title=""></p>



<pre class="prettyprint"><code class=" hljs python"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Human</span><span class="hljs-params">()</span>:</span>
    sum = <span class="hljs-number">0</span>
    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">__init__</span><span class="hljs-params">(self, name, age)</span>:</span>
        self.name = name
        self.age = age

    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">get_name</span><span class="hljs-params">(self)</span>:</span>
        print(self.name)

<span class="hljs-comment"># Student类 继承 Human类。</span>
<span class="hljs-comment"># Human是Student的父类，Student是Human的子类。</span>
<span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Student</span><span class="hljs-params">(Human)</span>:</span>
    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">do_homework</span><span class="hljs-params">(self)</span>:</span>
        print(<span class="hljs-string">'english homework'</span>)

<span class="hljs-comment"># 子类继承了父类的所有，所以可以调用</span>
student1 = Student(<span class="hljs-string">'石敢当'</span>, <span class="hljs-number">18</span>)
print(Student.sum, student1.sum, student1.name)
student1.get_name()</code></pre>



<pre class="prettyprint"><code class=" hljs python"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Human</span><span class="hljs-params">()</span>:</span>
    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">__init__</span><span class="hljs-params">(self, name, age)</span>:</span>
        self.name = name
        self.age = age

    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">do_homework</span><span class="hljs-params">(self)</span>:</span>
        print(<span class="hljs-string">'This is a parent method'</span>)

<span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Student</span><span class="hljs-params">(Human)</span>:</span>
    <span class="hljs-comment"># 在父类的基础上增加属性</span>
    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">__init__</span><span class="hljs-params">(self, school, name, age)</span>:</span>
        self.school = school
        <span class="hljs-comment"># 传参给父类</span>
        super(Student, self).__init__(name, age)

    <span class="hljs-comment"># 和父类同名时，优先调用子类的方法，所以需加super</span>
    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">do_homework</span><span class="hljs-params">(self)</span>:</span>
        super(Student, self).do_homework()
        print(<span class="hljs-string">'english homework'</span>)

student1 = Student(<span class="hljs-string">'人民路小学'</span>, <span class="hljs-string">'石敢当'</span>, <span class="hljs-number">18</span>)
print(student1.sum, student1.name)
student1.do_homework()</code></pre>

<hr>



<h1 id="7-正则表达式">7. 正则表达式</h1>

<p><strong>1） 正则表达式</strong></p>

<ul>
<li>正则表达式是一个特殊的字符序列，一个字符串是否与我们所设定的这样的字符序列相匹配。</li>
<li>快速检索、实现一些替换文本的操作。 <br>
<ul><li>如检查一串数字是否电话号码</li>
<li>如检测一个字符串是否符合email</li>
<li>如把一个文本里指定的单词替换为另外一个单词</li></ul></li>
</ul>



<pre class="prettyprint"><code class=" hljs python">a = <span class="hljs-string">'C|Python'</span>

print(a.index(<span class="hljs-string">'Python'</span>)&gt;-<span class="hljs-number">1</span>)
print(<span class="hljs-string">'Python'</span> <span class="hljs-keyword">in</span> a)
<span class="hljs-comment"># 均返回 True</span>

<span class="hljs-comment"># 使用正则表达式匹配</span>
<span class="hljs-keyword">import</span> re
r = re.findall(<span class="hljs-string">'Python'</span>, a)
<span class="hljs-keyword">if</span> len(r) &gt; <span class="hljs-number">0</span>:
    print(ok)
print(r)    <span class="hljs-comment"># 返回 ['Python']</span></code></pre>

<hr>



<h1 id="8-枚举类型">8. 枚举类型</h1>

<ul>
<li>枚举是一个类 <br>
<ul><li>from enum import Enum</li></ul></li>
<li>枚举类型不能被更改</li>
<li>枚举类型不能有相同标签（常量不能相同）</li>
<li>枚举不返回值</li>
<li>枚举类型不能实例化，属于单例模式</li>
</ul>

<p><strong>1） 区别</strong></p>



<pre class="prettyprint"><code class=" hljs python"><span class="hljs-comment"># 方法1：</span>
yellow = <span class="hljs-number">1</span>
green = <span class="hljs-number">2</span>

<span class="hljs-comment"># 方法2：</span>
a = {<span class="hljs-string">'yellow'</span>:<span class="hljs-number">1</span>, <span class="hljs-string">'green'</span>:<span class="hljs-number">2</span>}

<span class="hljs-comment"># 方法3：</span>
<span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">TypeDiamond</span><span class="hljs-params">()</span>:</span>
    yellow = <span class="hljs-number">1</span>
    green = <span class="hljs-number">2</span></code></pre>

<pre><code>以上方法的缺点：
    可变
    没有防止相同标签的功能
</code></pre>



<pre class="prettyprint"><code class=" hljs python"><span class="hljs-keyword">from</span> enum <span class="hljs-keyword">import</span> Enum  <span class="hljs-comment"># 枚举类</span>

<span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">VIP</span><span class="hljs-params">(Enum)</span>:</span>
    YELLOW = <span class="hljs-number">1</span>
    GREEN = <span class="hljs-number">2</span>
    BLACK = <span class="hljs-number">1</span>    <span class="hljs-comment"># 值相同时，BLACK相当于YELLOW的别名，即YELLOW_ALIAS</span>

print(VIP.YELLOW)         <span class="hljs-comment"># &lt;enum 'VIP'&gt;</span>
<span class="hljs-comment"># 返回： VIP.YELLOW</span>
print(VIP.BLACK)
<span class="hljs-comment"># 返回： VIP.YELLOW</span>
print(VIP[<span class="hljs-string">'YELLOW'</span>])
<span class="hljs-comment"># 返回： VIP.YELLOW</span>
print(VIP.YELLOW.value)
<span class="hljs-comment"># 返回： 1</span>
print(VIP.YELLOW.name)    <span class="hljs-comment"># &lt;class 'str'&gt;</span>
<span class="hljs-comment"># 返回： YELLOW</span>


<span class="hljs-keyword">for</span> v <span class="hljs-keyword">in</span> VIP:
    print(v)
<span class="hljs-comment"># 返回：(别名枚举不会被遍历)</span>
<span class="hljs-comment">#    VIP.YELLOW</span>
<span class="hljs-comment">#    VIP.GREEN</span>

<span class="hljs-keyword">for</span> v <span class="hljs-keyword">in</span> VIP.__members__:
    print(v)
<span class="hljs-comment"># 返回：</span>
<span class="hljs-comment">#    YELLOW</span>
<span class="hljs-comment">#    GREEN</span>
<span class="hljs-comment">#    BLACK</span>

<span class="hljs-keyword">for</span> v <span class="hljs-keyword">in</span> VIP.__members__.items():
    print(v)
<span class="hljs-comment"># 返回：</span>
<span class="hljs-comment">#    ('YELLOW',&lt;VIP.YELLOW: 1&gt;)</span>
<span class="hljs-comment">#    ('GREEN',&lt;VIP.YELLOW: 2&gt;)</span>
<span class="hljs-comment">#    ('BLACK',&lt;VIP.YELLOW: 1&gt;)</span></code></pre>

<p><strong>2） 枚举比较</strong></p>

<ul>
<li>枚举类型能做 <strong>等值比较、身份比较</strong>，不能做 <strong>大小比较</strong>。</li>
</ul>



<pre class="prettyprint"><code class=" hljs python"><span class="hljs-keyword">from</span> enum <span class="hljs-keyword">import</span> Enum

<span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">VIP</span><span class="hljs-params">(Enum)</span>:</span>
    YELLOW = <span class="hljs-number">1</span>
    GREEN = <span class="hljs-number">2</span>

result1 = VIP.GREEN == VIP.YELLOW
print(result1)    <span class="hljs-comment"># 返回：False</span>

result2 = VIP.GREEN == <span class="hljs-number">2</span>
print(result2)    <span class="hljs-comment"># 返回：False</span>

result3 = VIP.GREEN <span class="hljs-keyword">is</span> VIP.GREEN
print(result3)    <span class="hljs-comment"># 返回：True</span>

<span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">VIP1</span><span class="hljs-params">(Enum)</span>:</span>
    YELLOW = <span class="hljs-number">1</span>
    GREEN = <span class="hljs-number">2</span>

result = VIP.GREEN == VIP1.GREEN
print(result)    <span class="hljs-comment"># 返回：False</span></code></pre>



<pre class="prettyprint"><code class=" hljs python"><span class="hljs-keyword">from</span> enum <span class="hljs-keyword">import</span> Enum

<span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">VIP</span><span class="hljs-params">(Enum)</span>:</span>
    YELLOW = <span class="hljs-number">1</span>
    GREEN = <span class="hljs-number">2</span>

a = <span class="hljs-number">1</span>
<span class="hljs-comment"># 变成枚举类型，并非真正的类型转换</span>
print(VIP(a))   <span class="hljs-comment"># 返回：VIP.YELLOW</span></code></pre>



<pre class="prettyprint"><code class=" hljs python"><span class="hljs-keyword">from</span> enum <span class="hljs-keyword">import</span> IntEnum  <span class="hljs-comment"># 必须是数字</span>
<span class="hljs-keyword">from</span> enum <span class="hljs-keyword">import</span> unique

<span class="hljs-decorator">@unique    # 不允许值重复</span>
<span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">VIP</span><span class="hljs-params">(IntEnum)</span>:</span>
    YELLOW = <span class="hljs-number">1</span>
    GREEN = <span class="hljs-number">2</span></code></pre>

<hr>



<h1 id="函数式编程">函数式编程：</h1>

<ul>
<li>命令式编程：如 def 、if else、for …</li>
<li>函数式编程：如 map、reduce、filter、lambda …</li>
</ul>



<h1 id="9-闭包">9. 闭包</h1>

<ul>
<li>闭包 = 函数 + 环境变量（函数定义时候）</li>
</ul>

<p>例：</p>



<pre class="prettyprint"><code class=" hljs python"><span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">curve_pre</span><span class="hljs-params">()</span>:</span>
    a = <span class="hljs-number">25</span>    <span class="hljs-comment"># 环境变量</span>
    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">curve</span><span class="hljs-params">(x)</span>:</span>
        <span class="hljs-keyword">return</span> a*x*x
    <span class="hljs-keyword">return</span> curve

a = <span class="hljs-number">10</span>
f = curve_pre()
print(f(<span class="hljs-number">2</span>))    <span class="hljs-comment"># 返回： 100</span></code></pre>



<pre class="prettyprint"><code class=" hljs python"><span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">f1</span><span class="hljs-params">()</span>:</span>
    a = <span class="hljs-number">10</span>
    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">f2</span><span class="hljs-params">()</span>:</span>
        a = <span class="hljs-number">20</span>
        print(a)  <span class="hljs-comment"># 返回： 20</span>
    print(a)      <span class="hljs-comment"># 返回： 10</span>
    f2()
    print(a)      <span class="hljs-comment"># 返回： 10</span>

f1()
<span class="hljs-comment"># 返回：10  20  10</span></code></pre>



<pre class="prettyprint"><code class=" hljs python"><span class="hljs-comment"># 改变全部变量的方法：</span>
origin = <span class="hljs-number">0</span>    <span class="hljs-comment"># 全局变量</span>

<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">go</span><span class="hljs-params">(step)</span>:</span>
    <span class="hljs-keyword">global</span> origin
    new_pos = origin + step
    origin = new_pos
    <span class="hljs-keyword">return</span> new_pos

print(go(<span class="hljs-number">2</span>))      <span class="hljs-comment"># 返回： 2</span>
print(go(<span class="hljs-number">3</span>))      <span class="hljs-comment"># 返回： 5</span>
print(go(<span class="hljs-number">6</span>))      <span class="hljs-comment"># 返回： 11</span>


<span class="hljs-comment"># 闭包的方法：</span>
origin = <span class="hljs-number">0</span>

<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">factory</span><span class="hljs-params">(pos)</span>:</span>
    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">go</span><span class="hljs-params">(step)</span>:</span>
        <span class="hljs-keyword">nonlocal</span> pos
        new_pos = pos + step
        pos = new_pos
        <span class="hljs-keyword">return</span> new_pos
    <span class="hljs-keyword">return</span> go

tourist = factory(origin)
print(tourist(<span class="hljs-number">2</span>))      <span class="hljs-comment"># 返回： 2</span>
print(tourist(<span class="hljs-number">3</span>))      <span class="hljs-comment"># 返回： 5</span>
print(tourist(<span class="hljs-number">6</span>))      <span class="hljs-comment"># 返回： 11</span>
print(origin)          <span class="hljs-comment"># 返回： 0</span></code></pre>

<hr>



<h1 id="10-匿名函数">10. 匿名函数</h1>

<ul>
<li>不定义函数名的函数。</li>
</ul>

<p><strong>lambda 表达式：</strong></p>

<pre><code>lambda parameter_list: expression
</code></pre>

<p>例：</p>



<pre class="prettyprint"><code class=" hljs python"><span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">add</span><span class="hljs-params">(x, y)</span>:</span>
    <span class="hljs-keyword">return</span> x + y

add(<span class="hljs-number">1</span>, <span class="hljs-number">2</span>)

<span class="hljs-comment"># 等同于：</span>
f = <span class="hljs-keyword">lambda</span> x,y: x+y
f(<span class="hljs-number">1</span>, <span class="hljs-number">2</span>)</code></pre>

<p><strong>三元表达式：</strong></p>

<pre><code>条件为真时返回的结果 if 条件判断 else 条件为假时的返回结果
</code></pre>

<p>例：</p>



<pre class="prettyprint"><code class=" hljs php">x = <span class="hljs-number">2</span>
y = <span class="hljs-number">1</span>
r = x <span class="hljs-keyword">if</span> x &gt; y <span class="hljs-keyword">else</span> y
<span class="hljs-keyword">print</span>(r)    <span class="hljs-comment"># 返回：2</span></code></pre>

<p><strong>map 类：</strong></p>

<ul>
<li>把一个集合里的元素映射到新的集合里。</li>
</ul>



<pre class="prettyprint"><code class=" hljs python">list_x = [<span class="hljs-number">1</span>,<span class="hljs-number">2</span>,<span class="hljs-number">3</span>]

<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">square</span><span class="hljs-params">(x)</span>:</span>
    <span class="hljs-keyword">return</span> x * x

r = map(square, list_x)
<span class="hljs-comment"># 等同于：</span>
<span class="hljs-comment">#for x in list_x:</span>
<span class="hljs-comment">#   square(x)</span>

print(list(r))    <span class="hljs-comment"># 返回：[1,4,9]</span></code></pre>



<pre class="prettyprint"><code class=" hljs perl">list_x = [<span class="hljs-number">1</span>,<span class="hljs-number">2</span>,<span class="hljs-number">3</span>]
r = <span class="hljs-keyword">map</span>(lambda <span class="hljs-keyword">x</span>: <span class="hljs-keyword">x</span><span class="hljs-variable">*x</span>, list_x)
<span class="hljs-keyword">print</span>(list(r))    <span class="hljs-comment"># 返回：[1,4,9]</span></code></pre>



<pre class="prettyprint"><code class=" hljs perl">list_x = [<span class="hljs-number">1</span>,<span class="hljs-number">2</span>,<span class="hljs-number">3</span>,<span class="hljs-number">4</span>,<span class="hljs-number">5</span>]
list_y = [<span class="hljs-number">1</span>,<span class="hljs-number">2</span>,<span class="hljs-number">3</span>]
r = <span class="hljs-keyword">map</span>(lambda <span class="hljs-keyword">x</span>,<span class="hljs-keyword">y</span>: <span class="hljs-keyword">x</span><span class="hljs-variable">*x</span>+<span class="hljs-keyword">y</span>, list_x, list_y)
<span class="hljs-keyword">print</span>(list(r))    <span class="hljs-comment"># 返回：[2,6,12]</span></code></pre>

<p><strong>reduce 函数：</strong></p>

<ul>
<li>连续计算，连续调用 lambda，每一次的计算结果作为下一次计算的参数。</li>
</ul>



<pre class="prettyprint"><code class=" hljs python"><span class="hljs-keyword">from</span> functools <span class="hljs-keyword">import</span> reduce

list_x = [<span class="hljs-number">1</span>,<span class="hljs-number">2</span>,<span class="hljs-number">3</span>,<span class="hljs-number">4</span>]
r = reduce(<span class="hljs-keyword">lambda</span> x,y: x+y, list_x)
print(r)    <span class="hljs-comment"># 返回：10</span>
<span class="hljs-comment">#　((1+2)+3)+4</span>

r = reduce(<span class="hljs-keyword">lambda</span> x,y: x+y, list_x, <span class="hljs-number">10</span>)  <span class="hljs-comment"># 10为初始值</span>
print(r)    <span class="hljs-comment"># 返回：20</span>
<span class="hljs-comment">#　(((10+1)+2)+3)+4</span></code></pre>

<p><strong>filter 类：</strong></p>

<ul>
<li>过滤器</li>
</ul>



<pre class="prettyprint"><code class=" hljs php">list_x = [<span class="hljs-number">1</span>,<span class="hljs-number">0</span>,<span class="hljs-number">1</span>,<span class="hljs-number">0</span>,<span class="hljs-number">0</span>,<span class="hljs-number">1</span>]
filter(lambda x: <span class="hljs-keyword">True</span> <span class="hljs-keyword">if</span> x==<span class="hljs-number">1</span> <span class="hljs-keyword">else</span> <span class="hljs-keyword">False</span>, list_x)
<span class="hljs-keyword">print</span>(<span class="hljs-keyword">list</span>(r))    <span class="hljs-comment"># 返回：[1,1,1]</span></code></pre>

<hr>



<h1 id="11-装饰器">11. 装饰器</h1>

<ul>
<li>在不修改原函数代码的情况下，增加功能。</li>
<li>装饰器符号：@</li>
<li>一个函数可以增加多个装饰器</li>
</ul>

<p>例：</p>



<pre class="prettyprint"><code class=" hljs python"><span class="hljs-keyword">import</span> time

<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">f1</span><span class="hljs-params">()</span>:</span>
    print(<span class="hljs-string">'This is a function'</span>)

<span class="hljs-comment"># 在不修改原函数的情况下，增加打印时间戳</span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">print_current_time</span><span class="hljs-params">(func)</span>:</span>
    print(time.time())
    func()

print_current_time(f1)</code></pre>



<pre class="prettyprint"><code class=" hljs python"><span class="hljs-keyword">import</span> time
<span class="hljs-comment"># 装饰器</span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">decorator</span><span class="hljs-params">(func)</span>:</span>
    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">rint_current_time</span><span class="hljs-params">()</span>:</span>
        print(<span class="hljs-string">'123'</span>)
        func()
    <span class="hljs-keyword">return</span> rint_current_time

<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">f1</span><span class="hljs-params">()</span>:</span>
    print(<span class="hljs-string">'This is a function'</span>)

f = decorator(f1)
f()</code></pre>



<pre class="prettyprint"><code class=" hljs python"><span class="hljs-keyword">import</span> time
<span class="hljs-comment"># 装饰器</span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">decorator</span><span class="hljs-params">(func)</span>:</span>
    <span class="hljs-comment"># * 为可变参数, ** 为关键字参数</span>
    <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">rint_current_time</span><span class="hljs-params">(*args, **kw)</span>:</span>
        print(time.time())
        func(*args, **kw)
    <span class="hljs-keyword">return</span> rint_current_time

<span class="hljs-comment"># 装饰器名字</span>
<span class="hljs-decorator">@decorator</span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">f1</span><span class="hljs-params">(func_name， **kw)</span>:</span>
    print(<span class="hljs-string">'This is a function'</span>)

f1(<span class="hljs-string">'test func'</span>, a=<span class="hljs-number">1</span>, b=<span class="hljs-string">'2'</span>)</code></pre>

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